/*
 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc.
 * All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#ifndef SKY_ENGINE_CORE_RENDERING_RENDEROVERFLOW_H_
#define SKY_ENGINE_CORE_RENDERING_RENDEROVERFLOW_H_

#include "flutter/sky/engine/platform/geometry/LayoutRect.h"

namespace blink {
// RenderOverflow is a class for tracking content that spills out of a box.
// This class is used by RenderBox and InlineFlowBox.
//
// There are two types of overflow: layout overflow (which is expected to be
// reachable via scrolling mechanisms) and visual overflow (which is not
// expected to be reachable via scrolling mechanisms).
//
// Layout overflow examples include other boxes that spill out of our box,  For
// example, in the inline case a tall image could spill out of a line box.

// Examples of visual overflow are shadows, text stroke (and eventually outline
// and border-image).

// This object is allocated only when some of these fields have non-default
// values in the owning box.
class RenderOverflow {
  WTF_MAKE_NONCOPYABLE(RenderOverflow);
  WTF_MAKE_FAST_ALLOCATED;

 public:
  RenderOverflow(const LayoutRect& layoutRect, const LayoutRect& visualRect)
      : m_layoutOverflow(layoutRect), m_visualOverflow(visualRect) {}

  const LayoutRect layoutOverflowRect() const { return m_layoutOverflow; }
  const LayoutRect visualOverflowRect() const { return m_visualOverflow; }
  LayoutRect contentsVisualOverflowRect() const {
    return m_contentsVisualOverflow;
  }

  void move(LayoutUnit dx, LayoutUnit dy);

  void addLayoutOverflow(const LayoutRect&);
  void addVisualOverflow(const LayoutRect&);
  void addContentsVisualOverflow(const LayoutRect& rect) {
    m_contentsVisualOverflow.unite(rect);
  }

  void setLayoutOverflow(const LayoutRect&);
  void setVisualOverflow(const LayoutRect&);

  LayoutUnit layoutClientAfterEdge() const { return m_layoutClientAfterEdge; }
  void setLayoutClientAfterEdge(LayoutUnit clientAfterEdge) {
    m_layoutClientAfterEdge = clientAfterEdge;
  }

 private:
  LayoutRect m_layoutOverflow;
  LayoutRect m_visualOverflow;
  LayoutRect m_contentsVisualOverflow;

  LayoutUnit m_layoutClientAfterEdge;
};

inline void RenderOverflow::move(LayoutUnit dx, LayoutUnit dy) {
  m_layoutOverflow.move(dx, dy);
  m_visualOverflow.move(dx, dy);
  m_contentsVisualOverflow.move(dx, dy);
}

inline void RenderOverflow::addLayoutOverflow(const LayoutRect& rect) {
  LayoutUnit maxX = std::max(rect.maxX(), m_layoutOverflow.maxX());
  LayoutUnit maxY = std::max(rect.maxY(), m_layoutOverflow.maxY());
  LayoutUnit minX = std::min(rect.x(), m_layoutOverflow.x());
  LayoutUnit minY = std::min(rect.y(), m_layoutOverflow.y());
  // In case the width/height is larger than LayoutUnit can represent, fix the
  // right/bottom edge and shift the top/left ones
  m_layoutOverflow.setWidth(maxX - minX);
  m_layoutOverflow.setHeight(maxY - minY);
  m_layoutOverflow.setX(maxX - m_layoutOverflow.width());
  m_layoutOverflow.setY(maxY - m_layoutOverflow.height());
}

inline void RenderOverflow::addVisualOverflow(const LayoutRect& rect) {
  LayoutUnit maxX = std::max(rect.maxX(), m_visualOverflow.maxX());
  LayoutUnit maxY = std::max(rect.maxY(), m_visualOverflow.maxY());
  m_visualOverflow.setX(std::min(rect.x(), m_visualOverflow.x()));
  m_visualOverflow.setY(std::min(rect.y(), m_visualOverflow.y()));
  m_visualOverflow.setWidth(maxX - m_visualOverflow.x());
  m_visualOverflow.setHeight(maxY - m_visualOverflow.y());
}

inline void RenderOverflow::setLayoutOverflow(const LayoutRect& rect) {
  m_layoutOverflow = rect;
}

inline void RenderOverflow::setVisualOverflow(const LayoutRect& rect) {
  m_visualOverflow = rect;
}

}  // namespace blink

#endif  // SKY_ENGINE_CORE_RENDERING_RENDEROVERFLOW_H_
